Changes

| Nucleated cells  

| Nucleated cells  

| 0.3 - 5.5 x10e9/L (up to 7 x 10e9/L), of which the majority are [[Mesothelial cells|mesothelial cells]], [[Macrophages|macrophages]], non-degenerate neutrophils and small [[Lymphocytes|lymphocytes]]

| 0.3 - 5.5 x10e9/L (up to 7 x 10e9/L), of which the majority are [[Mesothelial cells|mesothelial cells]], [[Macrophages|macrophages]], non-degenerate neutrophils and small [[Lymphocytes|lymphocytes]]

|-}

|}

If the effusion has been caused by a neoplasm, exfoliated cells may be observed in the fluid but this is unlikely to be useful in identifying the origin of the tumour.

If the effusion has been caused by a neoplasm, exfoliated cells may be observed in the fluid but this is unlikely to be useful in identifying the origin of the tumour.